Process for the electrochemical roughening of aluminum for use as printing plate supports, in an aqueous mixed electrolyte
Patent 4618405 Issued on October 21, 1986. Estimated Expiration Date: 
April 23, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 23, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3755116 3887447 Process for electrolytic graining of aluminum sheet Printing plates Process for preparing lithographic printing plate bases Process for preparing lithographic printing plate bases Patent #: 4367124 InventorsApplicationNo. 06/726244 filed on 04/23/1985US Classes:430/278.1, Aluminum205/658, Simple alternating current205/660, Preliminary cleaning or shaping of workpiece205/661, Nonelectrolytic (e.g., mechanical grinding, milling, machining, etc.)205/674, Electrolyte composition or defined electrolyte205/682Phosphorus containingExaminersPrimary: Tufariello, T. M.Attorney, Agent or FirmInternational ClassesC25F 3/00 (20060101)C25F 3/04 (20060101) B41N 3/03 (20060101) Foreign Application Priority Data1984-04-25 DEAbstractDisclosed is a process for electrochemically roughening aluminum or aluminum alloys for use as printing plate supports, in an aqueous mixed electrolyte solution containing hydrochloric acid (HCl) and, as an additional inorganic electrolyte, at least one compound selected from the group consisting of condensed phosphoric acids, amidosulfonic acid, and the water-soluble alkali metal salts and ammonium salts thereof. In particular, the solution contains from 0.5 to 10% by weight of HCl and from 0.05 to 5.0% by weight of the additional inorganic electrolyte (for example, diphosphoric acid or polyphosphoric acid). The support materials which are particularly uniformly roughened are employed in the production of offset-printing plates.Other References
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